The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
As a significant part of electrical load, air conditioners draw attentions for their sometimes-unfriendly load characteristics, especially their dynamic responses during grid voltage disturbances. In this paper, a novel under-voltage control strategy for variable-speed air conditioners is introduced, which can keep air conditioners load characteristic as constant impedances when unexpected voltage...
A large number of distributed generations (DGs) connected to the distribution network have a significant impact on the stability of the power system due to their low inertia. Meanwhile the DGs are generally linked to the end of the distribution network, where power quality problems are very common. This paper applies virtual synchronous generator (VSG) technology in three-phase four-leg inverter....
Tremendous air-conditioner loads already have significant impact on the operation safety of Chinese distribution system. In the view of demand response, this paper aims to enhance distribution system voltage stability by improving inverter air-conditioners dynamic characteristics under power system short-term fluctuations. First of all, an inverter air-conditioner load model based on dynamic phasor...
Virtual synchronous generator (VSG) in single-phase to interface distributed renewable energy is investigated in this paper. Mathematical models and numerical analysis are utilized to illustrate the features of the VSG. Enhanced control strategy is presented to ensure the performance of the VSG. Besides, a second order generalized integer (SOGI) is employed to calculate the instantaneous output power...
In this paper, virtual synchronous generator (VSG) theory is investigated and utilized to control parallel inverters in a micro-grid, which is capable of sharing the local loads without communication lines. The mathematical model of VSG is built to describe the electromagnetic and mechanical characteristics of a synchronous generator. To make the model suitable for parallel inverters application,...
With the disadvantage of indirect control on stator voltage and the dependence on parameters such as stator inductance and flux linkage observer angle, the traditional cutting-in control strategy for doubly-fed induction generator (DFIG) lacks a highly control performance on stator voltage. As a result, the power grid voltage cannot be tracked precisely and a high impact current is generated in the...
It is difficult to obtain a more precise mathematical model of parallel-inverter system with a nonlinear load. Nonlinear load is the general factor which affects output voltage total harmonic distortion (THD) and current sharing. But fuzzy controller can control well without a precise mathematical model. Master-slave control is used to control the parallel-inverter system in this paper. The voltage...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.